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Afla diferențele , apoi verifica prin proba. 63-37 57-38 46-27 46-38 53-24 68-49.

Răspuns :

63-37=26
V:26+37=63
57-38=19
V:19+38=57
46-27=19
V:19+27=46
46-38=8
V:8+38=46
53-24=29
V:29+24=53
68-49= 19
V:19+49=68